Remove nova.flags usage
Remove nova.flags usage

There's no need to use nova.flags here, we can use our cfg module.

Change-Id: Ia6ecbf48a89a07b702d2955f89851b5c188a62fd
Signed-off-by: Julien Danjou <02b9c1d548d177421b793c726ed68b7aac9b5a66@enovance.com>

pczerkas/aodh,tanglei528/ceilometer,NeCTAR-RC/ceilometer,openstack/aodh,rackerlabs/instrumented-ceilometer,citrix-openstack-build/ceilometer,chungg/aodh,mathslinux/ceilometer,sileht/aodh,pkilambi/ceilometer,r-mibu/ceilometer,froyobin/ceilometer,MisterPup/Ceilometer-Juno-Extension,idegtiarov/ceilometer,fabian4/ceilometer,openstack/ceilometer,eayunstack/ceilometer,shootstar/ctest,m1093782566/openstack_org_ceilometer,Juniper/ceilometer,luogangyi/Ceilometer-oVirt,tanglei528/ceilometer,openstack/ceilometer,rickerc/ceilometer_audit,rackerlabs/instrumented-ceilometer,citrix-openstack-build/ceilometer,tanglei528/ceilometer,JioCloud/ceilometer,isyippee/ceilometer,pczerkas/aodh,ityaptin/ceilometer,cernops/ceilometer,rackerlabs/instrumented-ceilometer,eayunstack/ceilometer,dreamhost/ceilometer,NeCTAR-RC/ceilometer,openstack/aodh,citrix-openstack-build/ceilometer,rickerc/ceilometer_audit,maestro-hybrid-cloud/ceilometer,redhat-openstack/ceilometer,m1093782566/openstack_org_ceilometer,froyobin/ceilometer,maestro-hybrid-cloud/ceilometer,NeCTAR-RC/ceilometer,Juniper/ceilometer,mathslinux/ceilometer,pkilambi/ceilometer,fabian4/ceilometer,chungg/aodh,JioCloud/ceilometer,ityaptin/ceilometer,dreamhost/ceilometer,cernops/ceilometer,sileht/aodh,MisterPup/Ceilometer-Juno-Extension,r-mibu/ceilometer,idegtiarov/ceilometer,redhat-openstack/ceilometer,shootstar/ctest,luogangyi/Ceilometer-oVirt,rickerc/ceilometer_audit,isyippee/ceilometer,JioCloud/ceilometer